WHAT, bear tour??? Out of Juneau, the "only" choice, in my opinion is Pack Creek, via a fly in and having permits to get to the viewing platform. I would NEVER consider any of the tours which do not get on land, and expect you to view from the float plane- a poor choice to consider.
It is Mendenhall Glacier. The glacier dog sledding tours are enjoyed by many. It does not matter what company you use, all are similar. Be advised you do not drive any sleds, you are usually hooked up to two sleds, with 1 riding breaks, 2 passengers and the driver. You switch off as agreed. This is also the most canceled of Alaska tours, so always have back up plans.